Installed the Bartboy lever in the wife's FXT this weekend. WOW!
I have the Kartboy in my WRX and it didn't make the difference that it did in the FXT.
I did do one thing differently though. In order to make install a little easier I bolted the fork to the lever before I pushed the ball back in the socket. In the process of tightening the bolt I noticed that there was still a lot of slop with the bolt tight so....
I kept tightening the fork bolt until the slop was gone but BEFORE it started to bind.
I think I'll pull the lever out of the WRX this week and do the same thing.